Which statement is true about the value of 6

If f(x)= 3x+6 which of the following is the inverse of f(x)

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions.a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?